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17 77 17 78 17 79 17 80 17 81 17 82 17 83 17 84 17 85 17 86 17 87 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid